Add a message saying select all that apply
Remove need for simplified fractions
Remove simplification hint
Remove simplification step entirely
don't ignore parameter but use default
removed some unused vars
removed some unused vars
Finish hints
Change equivalent to equal
Merge pull request #130898 from petercollingridge/parallelperp

Change word "equivalent" to "equal"

Test Plan: none

Auditors: eater
Add knumber and equality to kmath

Summary:
Adds
k*.equal
kvector.colinear
kvector.negate
knumber.equal
knumber.sign

Test Plan: New unit tests

Reviewers: alex

Reviewed By: alex

CC: alpert

Differential Revision: http://phabricator.khanacademy.org/D5443
Replace ellipsis with actual fractions
Merge pull request #129299 from petercollingridge/tritypes

Add "Select all that apply" to triangle types

Test Plan: None

Auditors: eater
Add period

Auditors: peter
Merge pull request #129304 from petercollingridge/addmixed05

No need to simplify in adding and subtracting mixed numbers 0.5
Merge pull request #131724 from petercollingridge/addfrac2

Replace ellipsis with actual fractions
Added kpoint.compare for sorting arrays of points

Summary:
Added a kpoint.compare function to be used with Array::sort
Made kvector.equal more obviously correct for vectors of differing lengths
(technically it worked before, but relied upon 0 - undefined returning NaN)

Test Plan: Added unit tests

Reviewers: alex

Reviewed By: alex

CC: alpert

Differential Revision: http://phabricator.khanacademy.org/D5475
Merge pull request #130850 from petercollingridge/multipoly05

Create multiplying polynomials 0.5
Fix lint error for exercises/triangle_types.html

Test Plan: none

Auditors: peter
Fix divider hints

Resolves T1999. The divider was not putting things on the correct lines, leading to nonsensical hints.

Test Plan: Click through all the hints for at least one problem in each of converting_fractions_to_decimals, converting_fractions_to_decimals, dividing_decimals_0.5, dividing_decimals_3, dividing_decimals_4, dividing_rational_numbers, dividing_rational_numbers, dividing_rational_numbers, dividing_rational_numbers, division_1.5, division_2, division_3, and division_4

Auditors: peter, joel